decresc.

Noun

decrescendo (plural decrescendos or decrescendi)

1. An instruction to play gradually more softly.
2. A gradual decrease in volume or loudness of a piece of music.
   • The peace was ended by the sound of an approaching train, the steady exhaust beat that has its own appeal, and amid a cloud of steam a rebuilt "Scot" burst from under the bridge at the south end of the station, and roared past at high speed. A long line of lighted windows flashed past, and then, in...1954 January, H. P. White, “Vignettes of the Rail”, in Railway Magazine, page 53

See all 4 meanings of decrescendo